The correct answer is - C) had Jewish ancestors.
The Nuremberg Laws were defining a Jewish person by the person's ancestry. If someone had a Jewish ancestor and it was recorded in the documentations, than that persons was identified as Jewish, even though that person might have identified as other ethnicity, and was not practicing Judaism as its religion, it didn't matter.
The next step after the identification of the Jewish people was one of the biggest massacres in the world's history, known as the Holocaust, where it is estimated that around 6 million Jews were killed.
The cotton gin Was made in 1793 in order to remove seeds from Cotton fiber so the correct answer would be (B)
Was the main motivation for the Europeans Diamonds